APA
Pennysylvania State University, . (1974). Science in agriculture. Pennysylvania: Pennysylvania State University.
Chicago
Pennysylvania State University, . 1974. Science in agriculture. Pennysylvania: Pennysylvania State University.
Harvard
Pennysylvania State University, . (1974). Science in agriculture. Pennysylvania: Pennysylvania State University.
MLA
Pennysylvania State University, . Science in agriculture. Pennysylvania: Pennysylvania State University. 1974.